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노이즈 제거 알고리즘을 적용한 전도성 섬유 기반 손목형 ECG 시스템의 구현
최원철(Won-Cheol Choi),최정태(Jung-Tae Choi),이인수(In-Soo Lee) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.8
In recent years, the convergence of IT technology and all industries is taking place rapidly. In the textile industry, smart clothes or smart fiber combined with IT technology are emerging as a future high value-added industry. In this paper, we implemented the conductive fiber-based wrist ECG (Electrocardiogram) system with noise rejection algorithm. Namely, electrodes using conductive fibers were manufactured in a band of wrist parts to measure ECG signals and to eliminate noise with a digital filter. The noise rejection algorithm was also used to minimize the malfunction rate during the activity. The experiment results show that the performances of the proposed wrist ECG system are good. In particular, we were able to avoid heart rate measurement errors that could be generated by user’s movements after wearing a fiber-type ECG system because of noise rejection algorithm.
최원철(Won-Cheol Choi),조광년(Kwang-Nyun Cho),이인수(In-Soo Lee) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.5
In recent years, IT technology has been growing explosively with smart phones, and it has become a necessary component for all industries. Also, “smart clothing” and “smart fiber”, which are combined with IT technology and the textile industry, is attracting attention as a high value-added industry. Among them, wearable u-health device enables users to measure health variable without any sense of difference, have free hands and live without inconvenience. However, electrocardiogram (ECG) signals, which are bio-signals, are measured by using a band-type chest band or patch type Ag-AgCI electrode using conductive fibers to measure the wrist and ankle signals. Then the sense of heterogeneity was not completely resolved. In this paper, we fabricated electrodes using conductive fibers in the form of wrist bands to identify noise and P-QRS-T wave form in ECG signal measurement, the filter type and P-QRS-T wave signal to remove noise and the filter coefficient that can be realized by the digital filter. In addition, we measured the heart rate using RR-interval and compared it with Matron equipment to minimize the heterogeneity of smart clothing. From the experiment results, we verified the performances of the proposed conductive fiber-based wrist ECG system.
디바이스 시뮬레이션 기술을 이용한 미세 n-MOSFET의 비등온 비형형장에 있어서의 특성해석
최원철(Won-Cheol Choi) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.3
This simulator is developed for the analysis of a MOSFET based on Thermally Coupled Energy Transport Model(TCETM). The simulator has the ability to calculate not only stationary characteristics but also non - stationary characteristics of a MOSFET. It solves basic semiconductor devices equations including Possion equation, current continuity equations for electrons and holes, energy balance equation for electrons and heat flow equation, using finite difference method. The conventional semiconductor device simulation technique, based on the Drift-Diffusion Model (DDM), neglects the thermal and other energy-related properties of a miniaturized device. I, therefore, developed a simulator based on the Thermally Coupled Energy Transport Model (TCETM) which treats not only steady-state but also transient phenomena of such a small-size MOSFET. In particular, the present paper investigates the breakdown characteristics in transient conditions. As a result, we found that the breakdown voltage has been largely underestimated by the DDM in transient conditions.<br/> <br/>
Hydro Dynamic Model을 이용한 CMOS의 파괴특성의 Transient Simulation해석
최원철(Won-Cheol Choi) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.1
In present much CMOS devices used in VLSI circuit and Logic circuit. With increasing a number of device in VLSI, the confidence becomes more serious. This paper describe the mechanism of breakdown on CMOS, especially n-MOS, based on Hydro Dynamic model with device self-heating. Additionally, illustrate the CMOS latch-up characteristics on simplified device structure on this paper.<br/>
알레젠 제거 옻나무 추출물 투여로 생존기간이 연장된 편평세포폐암 환자 1례
김은희,박소정,최원철,이수경,Kim, Eun-Hee,Park, So-Jeong,Choi, Won-Cheol,Lee, Soo-Kyung 대한암한의학회 2011 大韓癌韓醫學會誌 Vol.16 No.2
Background : Lung cancer is one of the most common malignancy in the world. Types of lung cancer are Non small cell lung cancer and small cell lung cancer. Subtypes of Non small cell lung cancer are adenocarcinoma, squamous cell carcinoma and large cell carcinoma. Knowing the type of lung cancer is important in determining both treatment and prognosis. Recently, due to newly developed anti-cancer drugs, squamous cell carcinoma has relatively poor prognosis than non-squamous cell carcinoma. Case : We report a squamous cell lung cancer case treated with allergen removed Rhus verniciflua Stokes (aRVS) extract. The patients initially diagnosed stage squamous cell lung carcinoma, but she refused recommended operation. She initiated aRVS extract monotherapy in October. 2006. The follow up Computed tomography in March. 2007, she diagnosed stable disease of tumor response on aRVS treatment. However, this case was lost to follow up for 6 months while she was treated with tomotherapy. In October 2007, she came back to our cancer center after diagnosed stage IV metastasized lung to lung, and aRVS monotherapy was restarted. She had survived 2 years after metastasis of squamous cell lung carcinoma. Conclusion : Allergen removed Rhus verniciflua Stokes(aRVS) sucessfully prolonged overall survival of a squamous cell lung cancer patient.
쑥뜸치료(Moxibustion)로 호전된 비소세포성 폐암 환자의 암성 통증 1례
김민경,이진수,이상헌,정현식,최원철,김경석,Kim, Min-Kyung,Lee, Jin-Su,Lee, Sang-Hun,Jung, Hyun-Sik,Choi, Won-Cheol,Kim, Kyung-Suk 대한암한의학회 2009 大韓癌韓醫學會誌 Vol.14 No.1
Background & Objective: Regardless of types of cancer, cancer pain means the pain occurred by tumor itself, caused by complication or side effects during treatment and which is neither directly related to tumor nor treatment. This case was performed to relieve the cancer pain and study the effect of moxibustion to the cancer pain. Method: For 27 days, the patient was treated by moxibustion($MANINA^{(R)}$), acupuncture, herbal medicine and narcotic analgesics. We planned to maintain moxibustion on 8 points of Bladder meridian line(BL13, BL17, BL42, BL43) for 20 minutes. The improvement of the symptom was evaluated by BPI/VAS, and the amount of narcotic analgesics applied. Results: The BPI/VAS was declined and amount of applying narcotic analgesics was decreased. Conclusion: It is suggested that moxibustion on BL13, BL17, BL42, BL43 is useful to relief of cancer pain in left flank area.
소음인(少陰人) 태음병(太陰病) 심하비증(心下?證)의 병증약리(病證藥理) 고찰
서영광,이지원,이준희,최원철,이의주,고병희,Seo, Young-Kwang,Lee, Ji-Won,Lee, Jun-Hee,Choi, Won-Cheol,Lee, Eui-Ju,Kho, Byung-Hee 사상체질의학회 2010 사상체질의학회지 Vol.22 No.3
1. Objective: Gastric Stuffiness (心下?證) in the Soeumin Taeeum symptomatology (少陰人 太陰病) in Sasang Constitutional Medicine shows an interesting evolutionary process. Originally found in the texts of Sanghanlun (傷寒論), the perspectives regarding the symptoms of Gastric Stuffiness were expanded by many medical scholars and Lee Jema. To comprehend the Jema's concept of Taeeum symptomatology and utilize his prescription clinically, it deserves to study on the Gastric Stuffiness in Donguisuseowon (東醫壽世保元). 2. Methods: Many texts including Sanghanlun (傷寒論) and Dongeuibogam (東醫寶鑑) were reviewed in order to track the evolutionary process concerning the symptoms of Gastric Stuffiness. Also, Lee Jema's works including the different versions of Donguisuseowon (東醫壽世保元) were reviewed to examine the development of Lee's concepts regarding the Gastric Stuffiness in the Soeumin Taeeum symptomatology. 3. Results and Conclusions: 1) Most of the previous concepts on Gastric Stuffiness were generally similar to those found in Sanghanlun, especially in that they addressed Yang deficiency of the middle triple energizeer as the central pathogenic process. 2) Lee Jema's views on the epigastric discomfort in the Soeumin Taeeum symptomatology evoloved over time and culminated in the finalized pathology and therapeutics appearing in his last work, the Shinchuk version of Donguisuseowon (東醫壽世保元). 3) 4 kinds of prescription which invented by Lee Jema to treat the Gastric Stuffiness in the Soeumin Taeeum symptomatology can be matched to the prescription of Sanghanlun respectively. However through evolutionary process of Jema's prescriptions, the indication of them expanded: not only to treat Gastric Stuffiness but to diverse symptoms of Soeumin.